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Diagram showing the reduction in number of the Chromosomes in the process of maturation of the Ovum
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Oocytes
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An or '''ovocyte''' is a female
Gametocyte . Such that an oocyte is large and essentially stationary. The oocyte becomes functional when a lala (male gametocyte) attaches to it, thus allowing the meiosis of the secondary oocyte to occur.
There are two types of oocytes: primary oocytes and secondary oocytes.
Two primary oocytes are created when an
Oogonium divides by
Mitosis they are kept in a prolonged
Prophase I .
Each
Diploid primary oocyte divides in
Meiosis I into one
Haploid secondary oocytes and the first
Polar Body . The oocyte divides in
Meiosis II into one
Ootid and the second polar body.
The ootid
Differentiate s into an
Ovum
A second period of arrested development occurs after the first meiotic division forms the secondary oocyte. The egg may be expelled from the ovary in this condition. In many
species, including humans, the second meiotic division is not completed until the egg is fertilized by a sperm.
The formation of an oocyte is called ''oocytogenesis''. Thus, oocytogenesis is a form of
Gametocytogenesis whose male counterpart is
Spermatocytogenesis .
William K. Purves, Gordon H. Orians, David Sadava, H. Craig Heller, Craig Heller (2003). ''Life: The Science of Biology''(7th ed.), pp. 823–824
